The KDP spatial puzzle maker
Generate a whole book of cube-counting, draw-the-views or build-the-solid puzzles, then export it at every KDP trim, print-ready at 300 DPI. Make one puzzle free in your browser, unlock a full project for a one-time fee, and export unlimited formats forever.
$4.99 once per project. Unlimited exports, every trim. No subscription.
Every answer is checked
Each figure is built on a cube grid and checked before it prints: nothing floats, the shape is one piece, and a build-the-solid puzzle has exactly one shape that fits its views. The answer key comes from the same figure, so it cannot disagree with the puzzle.
Every KDP trim, 300 DPI
Pick any KDP size, from 5.06 by 7.81 up to 8.27 by 11.69, with correct margins and gutter. The figures are line art, so they print crisp in black and white at any size. Export a print-ready interior PDF and a separate answer-key PDF.
Generate once, export forever
One project unlocks for $4.99. After that, re-export any trim, any time, as many formats as you like. No monthly subscription and nothing to cancel.
How it works
- 1Start with a free puzzle. Try the free generator in your browser to make one puzzle and its answer, so you can see the output before you commit.
- 2Pick a puzzle type and a difficulty mix. In Publisher Studio, choose count the cubes, draw the views or build the solid, then how many puzzles at each grade from easy to expert. Single-type books sell best, and the studio grades them from gentle to hard.
- 3Generate and review. The studio generates every figure, checks it, and skips any that fail. You can turn on a how-to-solve page at the front, worked through the first puzzle in the book, and reject any figure you do not like.
- 4Unlock once, export any size. Pick a KDP trim, unlock the project for $4.99, then export the print-ready interior and answer-key PDFs at any trim, as often as you like.
Free tool or full studio
The free generator makes one printable puzzle to try the engine. Publisher Studio is where you make a book to sell. Browse the printable spatial puzzles to see each type and grade.
| Free generator | Publisher Studio |
|---|---|
| One puzzle and one answer page | Hundreds of puzzles with a packed answer section, 12 per page |
| One large-print size, browser print | Every KDP trim, 300 DPI, print-ready PDFs |
| Pick one type and one difficulty | A graded easy-to-expert curve, or a mixed order, across one type |
| No front matter | An optional how-to-solve page, worked through your own first puzzle |
| Nothing saved | A durable project, re-export any size forever ($4.99) |
One price, per project
$4.99
Paid once. Export unlimited formats, forever.
- Print-ready 300 DPI interior PDF
- Separate answer-key PDF
- Every KDP trim size and format
- Re-export any size, any time
Comparison
Once Books vs Book Bolt
A purpose-built puzzle-book maker you pay for once, versus an all-in-one KDP suite on a subscription.
Questions
- How much does it cost?
- A project unlocks for $4.99, paid once. After that you can export the interior and answer-key PDFs at any KDP trim, as many formats as you like, forever. There is no subscription.
- What do I get when I export?
- A print-ready 300 DPI interior PDF and a separate answer-key PDF, sized for the KDP trim you choose, with the margins and gutter that pass review. You upload them straight to KDP.
- What kinds of puzzle can a book have?
- Three types: count the cubes, draw the views, and build the solid. A book is built from one type, graded from easy to expert, because a single-mechanic book is easier to describe, easier to sell and easier to solve through. Make a second project for a second type.
- How do I know the answer keys are right?
- Every answer is drawn from the same cube-grid figure as its puzzle, so the two cannot disagree. The studio also checks each figure before it ships: no floating cubes, one connected piece, and for build the solid, exactly one shape that fits all three views. A figure that fails is never printed.
- Can I try it before I pay?
- Yes. The free spatial puzzle generator makes a real 2-page puzzle in your browser with no sign-up. The unlock is only for a full multi-puzzle project you plan to publish.
- Can I sell the books I make?
- Yes. The exported interiors are yours to publish and sell on Amazon KDP or print yourself. The per-project unlock covers unlimited exports of that project.